[cherrypick] Fix computation of runtime for throttled tasks

components/scheduler/base/time_domain.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_SCHEDULER_BASE_TIME_DOMAIN_H_
 #define COMPONENTS_SCHEDULER_BASE_TIME_DOMAIN_H_
 
 #include <map>
 
 #include "base/callback.h"
@@ skipping 28 matching lines @@
   };
 
   explicit TimeDomain(Observer* observer);
   virtual ~TimeDomain();
 
   // Returns a LazyNow that evaluate this TimeDomain's Now.  Can be called from
   // any thread.
   // TODO(alexclarke): Make this main thread only.
   virtual LazyNow CreateLazyNow() = 0;
 
+  // Computes a runtime which is >= |time_domain_now| + |delay|. This is used to
+  // allow the TimeDomain to decide if the real or virtual time should be used
+  // when computing the task run time.  This can be called from any thread.
+  virtual base::TimeTicks ComputeDelayedRunTime(
+      base::TimeTicks time_domain_now,
+      base::TimeDelta delay) const = 0;
+
   // Some TimeDomains support virtual time, this method tells us to advance time
   // if possible and return true if time was advanced.
   virtual bool MaybeAdvanceTime() = 0;
 
   // Returns the name of this time domain for tracing.
   virtual const char* GetName() const = 0;
 
   // If there is a scheduled delayed task, |out_time| is set to the scheduled
   // runtime for the next one and it returns true.  Returns false otherwise.
   bool NextScheduledRunTime(base::TimeTicks* out_time) const;
@@ skipping 86 matching lines @@
   Observer* observer_;
 
   base::ThreadChecker main_thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(TimeDomain);
 };
 
 }  // namespace scheduler
 
 #endif  // COMPONENTS_SCHEDULER_BASE_TIME_DOMAIN_H_